Convert Lowercase Letter To Uppercase Latter In Assembly Language Solution.

// Convert Lowercase Letter To Uppercase  Latter in Assembly Language.
/*
    *
    * Prosen Ghosh
    * American International University - Bangladesh (AIUB)
    *
*/

Solution:

.model small
.stack 100h
.data
 
    ask db 'ENTER A LOWERCASE LATTER: $'
    val db ?
    str db 0ah,0dh,'YOUR ENTERED UPPERCASE LATER IS: '
    ans db ?
    finish db '$'
 
.code

main proc
 
 
    mov ax,@data
    mov ds,ax
 
    mov ah,9
    lea dx,ask
    int 21h
 
    mov ah,1
    int 21h
    mov val,al
 
    sub al,20h
    mov ans,al
 
    mov ah,9
    lea dx,str
    int 21h
 
    mov ah,4ch
    int 21h 
    main endp
end main